Finding the Fourth Proportional to 1,064.53, 1,469.78 and 666.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.53 : 1,469.78 = 666.35 : x
2. Step 2: Convert to fraction form
   1,064.53/1,469.78 = 666.35/x
3. Step 3: Cross multiply
   1,064.53x = 1,469.78 × 666.35
4. Step 4: Simplify right side
   1,064.53x = 979,384.57
5. Step 5: Solve for x
   x = 979,384.57/1,064.53
6. Step 6: Final answer
   x = 920.02